I got 8.6. We can't tell where your mistake is until you post your working.Said90 said:A car travels 10 km due EAST then 12. Km NW what is Magnitude of the car's displacement.
The answer that I got in my book is 8.8
Could anyone-please-explain ?The Attempt at a Solution
6.6 km[/B]
haruspex said:I got 8.6. We can't tell where your mistake is until you post your working.
It is not a right-angled triangle. Do you know a rule for finding the third side of a triangle given two sides and the angle between them?Said90 said:***I made a mistake .. The answer in the book is 8.6***I've just applied Pythagorean theorem to get the answer !
144 = 100+X^2
Could please explain your answer?
haruspex said:It is not a right-angled triangle. Do you know a rule for finding the third side of a triangle given two sides and the angle between them?
Draw yourself a diagram.Said90 said:Yea..I got the idea
C^2=a^2+b^2- 2bc COSa
But still don't know how to get the angle's value